LX1911

www.DataSheet4U.com TM ® LX1911 1.5A, 1.1MHZ PWM Step-Down Regulator P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES ƒ Internal Reference 800mv ±2% Accuracy (Line and Temp.) ƒ 4.0V to 6.0V Input Range ƒ Internal Soft Start ƒ Adj. Output From 0.8V to VIN ƒ Output Current (I >1.5A) ƒ Quiescent Current < 550μA, typical @ 23°C ƒ 1.1MHz PWM Frequency ƒ Micro Lead-frame, Thin MO229, 6-Pin Package APPLICATIONS/BENEFITS ƒ Portable Microprocessor Core Voltage Supplies ƒ 5V to 3V The LX1911 operates as a Current Mode PWM Buck regulator that switches to PFM mode with light loads. The entire regulator function is implemented with minimal external components. The LX1911 responds quickly to dynamic load changes using a high bandwidth error amplifier and internal compensation. Tight output voltage regulation is maintained with the compensated 800mV, ±2% reference (line and temp regulation). With two external resistors the output voltage is easily programmed, from 800mV to 90% of VIN. The regulator is capable of providing an output load current of 1.5A and has no minimum load current requirement for stable operation. Current limit is cycle-by-cycle to protect the switch. Power conversion efficiency is maximized with a low regulator IQ and PFM mode of operation. The LX1911 operational range covers 4.0V to 6.0V, features include power on delay; soft start to limit inrush currents; and thermal shutdown during fault conditions. The 6-pin package is a small, RoHS compliant / Pb-free, MO-2...